networking - Ubuntu 16.04 Connects to Ethernet and Wifi but no Internet - Ask Ubuntu


as title says, cannot connect new ubuntu computer internet means. not sure if dealing 3 independent problems here, or if more fundamental preventing me accessing internet. appreciated.

ethernet

ubuntu connects (slowly) router when connected directly cable. there other computers on network know not router. router not register new computer, , don't ipv4 address, , there no data transfer. i've tried disabling ipv6 , nothing.

wifi

as before there other computers on wifi network. i've tried (ralink rt2760) wifi card in ubuntu computer , works fine, not that. ubuntu connects wifi after few minutes there no data transfer, , doesn't connect @ all. have tried disabling ipv6 , makes no difference. have tried booting disk new computer on old computer new wifi card, , wifi works, know drivers ok.

bonus: tethering through mobile

i can connect other ubuntu computers tethering them through android phone. doesn't work on new computer since either crashes phone, or error message 

unable open mtp device '[usb:002,010]'

when activate tether.

terminal outputs

route kernel ip routing table destination     gateway         genmask         flags metric ref    use iface default         *               0.0.0.0         u     1002   0        0 enp3s0 link-local      *               255.255.0.0     u     0      0        0 enp3s0  lspci 03:00.0 ethernet controller: realtek semiconductor co., ltd. rtl8111/8168/8411 pci express gigabit ethernet controller (rev 0c) 04:07.0 network controller: ralink corp. rt2760 wireless 802.11n 1t/2r  rfkill list wlan 0: phy0: wireless lan     soft blocked: no     hard blocked: no  ifdown wlp4s7 unknown interface wlp4s7  ifconfig (when connected wifi) enp3s0    link encap:ethernet  hwaddr 40:8d:5c:8f:94:ec             broadcast multicast  mtu:1500  metric:1           rx packets:0 errors:0 dropped:0 overruns:0 frame:0           tx packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:0 (0.0 b)  tx bytes:0 (0.0 b)  lo        link encap:local loopback             inet addr:127.0.0.1  mask:255.0.0.0           inet6 addr: ::1/128 scope:host           loopback running  mtu:65536  metric:1           rx packets:1644 errors:0 dropped:0 overruns:0 frame:0           tx packets:1644 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1            rx bytes:120528 (120.5 kb)  tx bytes:120528 (120.5 kb)  wlp4s7    link encap:ethernet  hwaddr 00:1f:1f:3c:26:8a             inet addr:192.168.0.9  bcast:192.168.0.255  mask:255.255.255.0           inet6 addr: 2a02:810d:12c0:d4b:c893:9437:3913:6aad/64 scope:global           inet6 addr: 2a02:810d:12c0:d4b:21f:1fff:fe3c:268a/64 scope:global           inet6 addr: fe80::21f:1fff:fe3c:268a/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:11 errors:0 dropped:0 overruns:0 frame:0           tx packets:84 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:2763 (2.7 kb)  tx bytes:13791 (13.7 kb)  dmesg (extract) [  868.636154] wlp4s7: send auth 54:67:51:01:c7:d7 (try 1/3) [  869.904104] wlp4s7: send auth 54:67:51:01:c7:d7 (try 2/3) [  870.904066] wlp4s7: send auth 54:67:51:01:c7:d7 (try 3/3) [  871.892046] wlp4s7: authentication 54:67:51:01:c7:d7 timed out [  872.075996] ieee80211 phy0: rt2x00queue_flush_queue: warning - queue 0 failed flush [  877.091384] ipv6: addrconf(netdev_up): wlp4s7: link not ready [  877.251889] ieee80211 phy0: rt2x00queue_flush_queue: warning - queue 0 failed flush [  877.411906] ieee80211 phy0: rt2x00queue_flush_queue: warning - queue 0 failed flush [  878.464502] wlp4s7: authenticate 54:67:51:01:c7:d7 [  878.631789] ieee80211 phy0: rt2x00queue_flush_queue: warning - queue 0 failed flush [  878.639934] wlp4s7: send auth 54:67:51:01:c7:d7 (try 1/3) [  879.879839] wlp4s7: send auth 54:67:51:01:c7:d7 (try 2/3) [  879.935703] ipv6: addrconf(netdev_up): wlp4s7: link not ready [  879.938278] wlp4s7: aborting authentication 54:67:51:01:c7:d7 local choice (reason: 3=deauth_leaving)

if haven't done already, try trying new ethernet cable or use cable know works other computers. slow partial connection may mean faulty cable.


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